Slab ceiling construction and means for hanging the slabs



June 21, 1932. c, DAV|5 ET AL I 1,863,565

SLAB CEILING CONSTRUCTION AND MEANS FOR HANGING THE SLABS Filed July 5. 1929 2 Sheets-Sheet 1 CLARK F. DAVIS INVENTORS EDWQXRD R. SAUNDERS ATTORNEY J 1932- c. F. DAVIS ET AL 1,863,565

SLAB CEILING CONSTRUCTION AND MEANS FOR HANGING THE SLABS Filed July 5, 1929 2 Sheets-Sheet 2 CLARK F. DAVIS EDWARD R. SAUNDERS INVENTORS ATTORNEY Patented June 21, 1932 UNITED STATES PATENT OFFICE CLARKE F. DAVIS, OF WESTFIELD, AND EDWARD R. SAUNDERS, 0F GRANFORD, NEW JERSEY, ASSIGNORS TO STRUCTURAL GYPSUM CORPORATION, OF LINDEN, NEW JERSEY, A CORPORATION OF DELAWARE SLAB CEILING CONSTRUCTION AND MEANS FOR HANGING THE SLABS Application filed July 5,

purlin by means secured to the top of the beam, this hanger means being secured to a device embedded in the slab which engages the reinforcement therein.

The patent to Rowan N 0. 1,632,453, discloses a building construction in which a plurality of precast slabs are suspended from a single hanger supported from the top of the beam, thishanger projecting within a recess in one of the blocks and engaging there the extended ends of reinforcements from adjacent blocks.

It is among the objects of this present invention to provide a hanger and a building construction which will be an improvement upon the constructions shown and described in the above patents, and which will permit the slabs to be suspended from below the top of a floor beam or purlin. Such a construction has a number of advantages over those shown in the above patents, among which is that, when using the same floor beams to support a floor composed of precast slabs, the floor slabs may rest perfectly flat upon the tops of the beams, as no part of the present hanger engages the top surface of the beam.

To this end the invention contemplates hanger means of various forms adapted to engage and be suspended entirely from the bottom flange or flanges of a beam or purlin for suspending a ceiling below the beam, by engagement with a reinforcement within the slabs forming the same, and in a building Serial No. 375,927.

construction comprising the hanger, vthe beam and the slab.

In carrying out the invention in one of its aspects, a hanger is used having the main body thereof located below the bottom flange of a beam, and having deformed portions extending above the flange and securing the hanger thereto, the hanger being provided with a heel portion for preventing accidental displacement thereof prior to its being permanently attached to the beam, and a depending portion having a loop or aperture for engagement with the reinforcement within the slab or slabs for suspending the same below the beam.

The invention contemplates a hanger, such as above described, in which the same is constructed either of flat strap stock or wire or round stock, so arranged that the depending 1 portion of the hanger is located either below the edge of a bottom flange of a beam, or be low the center of the bottom flange thereof.

In all forms of the invention the slabs may be suspended so that the tops thereof are substantially flush with the under-surface of the beam or they may be hung so as to provide a material space between the top thereof and the. bottom of the beams for the passage of pipes, wires or the like.

In the drawings:

Fig. 1 is a perspective View of one form of the invention.

Fig. 2 is a sectional View showing the device of Fig. 1 in use.

Fig. 3 is a view along the line 33 of Fig. 2.

Fig. 4 is a sectional View similar to Fig. 2 showing the device of Fig. 1 in use with a channel beam.

Fig. 5 is a viewshowing the device of Fig. 1 as used with a beam having van open web.

Fig. 6 is a view along the line 66 of Fig.

Fig. 7 is a sectional view similar to Fig. 2

showing a method of hanging slabs well below the bottom ofa beam.

Referring to the. embodiment shown in Fig. l the hanger proper may conveniently consist of a metallic shape having a body 1 anupstanding heel 2, a foot 3 and a leg 4 The leg 4; is provided with an aperture 5 to receive the projecting ends 6 of reinforcements 7 of precast slabs 8, which ends project into recesses 9. The arrangement of the slabs and their reinforcements is substantially that as shown and described in the patent to Rowan No. 1,632,453 above referred to.

In use and as shown in Fig. 2 the foot 3 may be first slipped onto. a flange 10 of a. beam 1-1, and when in place the, body 1 moved up against the bottom of the flange so that the heel 2 occupies the positf on shown. A slight blow of ahammer by a workman, on the foot 3 will deform this portion down against the top of the flange 10 and the device will be secured in place. It is not necessary to have the foot 3 spaced very far from the body 1 in order to slip the hanger onto the beam flange. The heel 2 need extend upwardly only a short distance, as the entire weight of the slabs is borne by the leg 4 and thefoot .3 and there is, therefore, no tendency for the heel 2 to slip from the beam.

Obviously, the device of Fig. 1 may be used with any type of beam having a bottom flange, and in Fig. 4 the device is shown with a channel beam 12. As above pointed out,

due .to .the fact that the entire weight of the slabs is. borne by the leg 4 and the foot 3,

the heel 2 simply serves the purpose, with a channel as with an I beam, to prevent accidental displacement of the hanger prior to erection and suspension of the slabs.

In Figs. 5 and 6 the device of Fig. 1 is shown as used with a beam having an open type of web. This beam may conveniently consist of two pairs of L irons 13 enclosing between the pairs, a rod or bar 14 arranged in. 2. formation, that portion of the Z enclosed between pairs of L irons being pressure-welded throughout as at 15. While this type of beam has been found convenient in some instances, yet its illustration here is simply for the purpose of disclosing the wide range of use of hangers embodying this invention.

lVhe're it is desired to suspend the slabs well below the bottom of the beam, this may be done by lengthening the leg as at 16, v

Fig. 7..

In the description of the hanger of Flgs.

,1 to 7 inclusive, it is to be noted that the leg 4 or 16. is located directly below the edge of one of the flanges on the bottom of the beam. While this is, a convenient method of hanging the slabs, yet it is not absolutely essentiahas it is entirely possible to so position the depending leg as to locate the same below the center of the beams bottom flange.

In all casesthe Invention contemplates the filling of the recess or recesses in the ends of the slabs with grouting which embeds the projecting end of the reinforcement and the hanger therein. This not only serves to protect the hanger from fire but likewise produces a substantially monolithic ceiling construction.

It will be apparent that in a single build ing construction any or all of the various forms of hanger combinations herein shown and described may be used as in some parts of the building it may be desirable to suspend the slabs from I beams, in others from channel beams and in still other portions from a beam having an open web such as shown in Fig. 5. Again, where the bottoms of all beams from which slabs are to be suspended are not on the same level, a ceiling having a uniformly fiat under-surface may still be provided by utilizing the combination of hangers such as shown in Figs. 2 and 7 It may be found necessary to provide a plurality of hangers for each end of each slab, depending entirely upon the size and weight of the slab, and in such event the reinforcing rods and hangers may be multiplied as desired to suspend the slab from any number of points.

The recesses within which the projecting ends of the reinforcements are located may take the form of a channel or rabbet extending the entire width of the end of each slab, in which event the grouting will be flowed into the recess or rabbet to completely close the same after erection to form a substantially monolithic structure.

The gauge or dimensions of the hanger or hangers will obviously be determined by the weight of slabsto be suspended thereon, but, as ordinarily no weight rests upon thesehangers except that of the slabs themselves, and possibly the occasionalweight of a Workman during erection, the hanger need not be made of unnecessarily heavy material.

In arranging the slabs in position to form a floor it will only be necessary to place the hanger in the desired location and then lift the individual slab into position, so that the end of the reinforcement therein passes through the loop or aperture in the hanger as i the case may be. The adjacent slab may likewise be positioned either on this same hanger or upon its individual hanger.

It will be apparent that the above hanger and its method of use provides a simple and expeditious manner of suspending slabs from below the top of a floor beam while leaving the upper surface of the beam perfectly flat and without parts projecting thereabove to interfere with the floor to be laid directly thereon. The ceiling itself has a uniformly flat under-surface and is produced without requiring subsequent adjustment and Without the necessity of providing forms or the like. a

The fact that the entire under-surface of each slab consists of an unbroken mass. of gypsum or the like, is highly desirab1e,,in that it forms a fireproof protection not only to the beams and girders, but also to the reinforcements in the slabs and to the hangers engaging the same.

The beams or girders shown may be either those usually occurring in a building structure or specially provided and spaced to take the length of slabs used.

hat we claim is:

1. As an article of manufacture, a hanger for suspending precast slabs from the bottom flange of a beam comprising a body portion adapted to underlie the bottom flange of the beam, a foot at one edge of the body portion adapted to overlie the flange, a vertically upstandin heel at the opposite edge of the body adapted to extend upwardly alongside of the beam, and an apertured leg depending from the body portion.

2. The combination of a beam having a lower flange, a precast slab of plastic material below the beam, having a metallic reinforcement therein projecting from the end of the slab, a hanger having a body portion underlying the flange of the beam, a vertically extending heel at one edge of the body extending upwardly alongside of the beam in a nonoverlying relationship, the other edge of the body portion of the hanger having a foot portion overlying the beam flange and a depending apertured leg, the end of the slab reinforcement penetrating said aperture.

In testimony whereof, we have hereunto subscribed our names this 2nd day of July,

CLARKE F. DAVIS. v EDWARD R. SAUNDERS. 

